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Criteria based on CT imaging after chemotherapy may help predict survival
Date:12/1/2009

Preliminary research suggests that criteria based on computed tomography (CT) imaging of changes in tumors from colorectal liver metastases after chemotherapy with the drug bevacizumab may have the potential to predict overall survival, according to a study in the December 2 issue of JAMA.

The addition of bevacizumab to cytotoxic (toxic to cells) chemotherapy is associated with improved survival in patients with stage IV colorectal cancer and higher pathologic response rates in patients undergoing resection (surgical removal) of colorectal liver metastases. "Recently, pathologic response to preoperative chemotherapy has been shown to correlate with improved survival and has been proposed as a new outcome end point after resection of colorectal liver metastases. To date, a noninvasive method of predicting pathologic response to chemotherapy in colorectal liver metastases, particularly biologic agents, is lacking," the authors write. They add that it has been observed that after bevacizumab-containing therapy, colorectal liver metastases tend not only to decrease in size but also to undergo unique morphologic (form and structure) changes on CT.

Yun Shin Chun, M.D., of the University of Texas M. D. Anderson Cancer Center, Houston, and colleagues conducted a study to validate tumor response criteria that are based on morphologic changes observed on CT in patients with colorectal liver metastases treated with bevacizumab-containing chemotherapy regimens. The researchers analyzed a total of 234 colorectal liver metastases from 50 patients who underwent hepatic resection (removal of tumors involving the liver) after preoperative chemotherapy that included bevacizumab, from 2004 to 2007; date of last follow-up was March 2008. All patients underwent routine contrast-enhanced CT at the start and end of preoperative therapy. Radiologists evaluated images for morphologic response, based on metastases changing from heterogeneous masses with ill-def
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Contact: Laura Sussman
lsussman@mdanderson.org
713-745-2457
JAMA and Archives Journals
Source:Eurekalert

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